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Tuesday, June 23, 2026

Line for June 23, 2026

Put these 5 milestones in time order, earliest at the top. The years appear when you lock in your order.

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Earliest

  1. 1
    Elimination polio

    The last case of wild polio acquired in the United States

  2. 2
    Vaccine HPV

    The first HPV vaccine is licensed in the U.S.

  3. 3
    Vaccine hepatitis A

    The first hepatitis A vaccines are licensed in the U.S.

  4. 4
    Eradication smallpox

    The World Health Assembly declares the world free of smallpox

  5. 5
    Discovery measles

    A Scottish physician shows measles is caused by an infectious agent in the blood

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